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Answer:
51 - 30 = 21
Step-by-step explanation:
Given that , 30 persons reap a field in 20 days .
So , work done = 30 × 20 = 600
Work done in 3 days = 30 × 3 = 90
Work remaining = 600 - 90 = 510
A/Q , 10 days are taken to complete the work 510 .
∴ Number of people required to complete the work = 510 ÷ 10 = 51 .
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